The invention relates to the field of air purification. According to the technical scheme, a waste gas treatment system comprises a shell with a gas inlet and a gas outlet, a primary filter and a plurality of high-voltage electrostatic fields are successively arranged in the shell in the air circulation direction, and a dioxin catalyzing device and an oxynitride catalyzing device are further arranged at the rear of the high-voltage electrostatic fields. By the technical scheme, combusted waste gas passes through the primary filter, large particulate matters in the waste gas can be filtered and adsorbed, by the effect of the high-voltage electrostatic fields, dust of the waste gas can be adsorbed, dioxin is adsorbed on the surface of the dust at normal temperature, the dust with the dioxin is adsorbed on walls of metal tubes of the high-voltage electrostatic fields, the dioxin catalyzing device and the oxynitride catalyzing device are arranged at the rear of the high-voltage electrostatic fields, by the dioxin catalyzing device, dioxin nitrogen in the waste gas can be purified further, the oxynitride catalyzing device can catalyze and decompose oxynitride, and finally, the purpose of purifying the combusted waste gas during discharging is achieved.